"Why do you set " power" on 744's (RB 211 524-H) based on EPR and not on N1 or N3 like on the 757's."
Isn't this because GE owns the copyright on N1's as primary engine indication? (Or is that another Urban Legend?)
In other words, RR and P&W didn't have a choice (unless they wanted to pay royalties to GE).
Regards.
Q.
Inlet pressure is "P2" on the 744RR. You can see the P2T2 sensor just in front of the fan at the 12 o'clock position.
Exhaust pressure (Pint) is a combination of P5 (core) and P1.3 (fan) exhaust.